Thanks BurrMan
I get what you say, I hope. I like nurbs but coming at it from an uninformed direction did not really understand why there were several types of modeling. You have all helped m understand something that to most people is very specialist knowledge. I have HUGE respect for you all and have been trying to explain to my wife, a psychologist, how you all make things out of maths, points and lines. I think she humors me:)
Keith